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I am trying to model a reinforced concrete structure. As the structure is large, our intention is only to model the detail reinforced concrete elements for a small area of interest. For other portion of the structure, our intention is to model the reinforced concrete element by beam elements. I converted the reinfored concrete section to a uncracked transformed section, where the reinforcement has been converted to concrete. Then I used beam elements to model the uncracked transformed section, connect them to the detail reinforced concrete portion being modeled and run the simulation.